Supporting means for gyratory sifters



19', 1938 i E. G. BERRY Er AL 2,123,876

SUPPORTING MEANS FOR GYRATORY SIF TERS Filed March 12, 1936 3Sheets-Sheet l L :5 W 0 E21 are 6' Eer1'y 00556.5 fez/male:

u y 1938. E. G. BERRY ET AL 2,123,876

SUPPORTING MEANS FOR GYRATORY SIFTERS Filed March 12, 1936 4 3Sheets-Sheet 2 d e I Cali 5Z2. 0775/ eff E. s. BERRY ET AL ,8

SUPPORTING mums FOR GYRATORY SIFTERS 'Filed March 12, 1936 3Sheets-Sheet 3 July 19, 1938.

Patented July 19, 1938 UNIT STAT ES- owl-{cs SUPPORTING MEANS FORGYRiA-TORY SIFTERS EugeneG. Berry and Caryl L. Iteirnuller, Chicago,Ill., assignors to B..F. GurnpCm, Chicago, 111.,

Thisinvention relates to agyratory sifter and concerns itself with novelsupporting means for causing the sifter to travel in a circular path.

It is an object of the present invention to support thesifterorscreenbox'independently of. .the operating-means sothat the weight thereof Inthe accompanying drawings which illustrate a preferred'eform of thisinvention and. in

20 whichsimilarreference numerals refer to similar features in thedifferent views:

Figure 1, is a part elevational and part sectional View 'of a gyratorysifter-involving this invention. Figure 2 is vvanenlargeolsectionalview-of the upper end of a wobble post.

Figure 3 is an enlarged fragmentary sectional. view through the baseandthe lower end of va-free wobble post- Figure 4 is an enlargedfragmentary-sectional,

view throughthebase and. the lower end of one of the controlled wobbleposts,

Figure. 5 is, a fragmentary sectional View through the basetakensubstantially upon the 35 line V-V of Figure 4, showing parts inelevation.

Figure 6 is a fragmentary plan view of the sifter chassis, showing indotted lines the gymtory movement.

40 As shown on the drawings:

On the drawings, there is shown a sifter or screen box I which may be ofany suitable construction. It is supported upon two pairs of wobbleposts 2 and3 which in turn are supported 45 on a metal base 4. The metalbase has a channel 5 at one margin in which a rockable shaft 6 isjournaled by means of bearings which are located in lubricant chambers 8formed in the ends of the channel 5 which is closed by a cover strip 504a provided with suitable apertures 8 through which the wobble posts 2extend. Oil seals 9 may also be placed in suitable recesses in the innerwalls IU of the lubricant chambers for retaining the lubricant againstmovement on the 55 shaft 6.

The. wobble posts 21 have yokes 2w at their lower ends- The.bifurcations ofthese yokes are of such' a-=size as to readily fit overthe shaft 6. Bolts. orpins forming trunnions ll extend through the. armsof the yokes and shaft 6 for connecting the posts-to. said shaft. Thepins II are preferablyanchored in position by means of dowel :pinsl2-which-extend through the shaft 6 and." pins ll. Each wobble post 2may be provided Witheagroove l3 :for receiving an anchorring -I 4 uponwhich-a flexible hood 'or stocking l5 is -secured.;; The hood l5.is alsofastened to the 1 top ofthe base bymeans of a ring l6, as shown.

The-purpose of the hood is to prevent'dust from entering the. lubricantchambers.

The :upper ends of the. two wobble posts 2 are formed withsockets I1, asshown in Figure 2.

A bearing l8.r.having. a parti-spherical bearing recess .issecured' inthe bottom of'each socket.

A sphericalbearingl9rin the form of a ball is located in :eachsocket andseated. in the bearing recess :ofits bearing I8. A bearing ring 20 ispreferably threaded in the upper end of each sockettand is fashioned -tofitthe curved surface of the bearing ball I9; The sockets l1 may be 5enlarged'above-the bearings l8," as indicated at 2t; torprovide-alubricant chamber.-

: Suitablemetal pads 22: are secured to the spherical .bearings..l9.These. pads are preferablyep rovidedwith bosses 23::carrying screws 24threaded into. the spherical bearings. The bosses 23.;andz-thesocket'headsof-the posts 2 are also provided with grooves for receiving,rings 25. to:which" a flexible stocking Zliis. secured to exclude dustfrom the bearing.

The two wobble posts 3 are provided at their lower ends with sphericalbearings 21, as shown in Figure 3. These spherical bearings 21 arelocated in suitable bearing boxes 28 supported and secured upon shelves29 extending from a side wall of the base below the top thereof, the topof the base being cut away to receive the bearing boxes. Within eachbearing box 28, there is a bearing l8, as before described, forsupporting the spherical bearing 21. Likewise, the bearing boxes areenlarged as indicated at 2| to provide a lubricant chamber. A flexiblehood or stocking 30 surrounds each post 3. The hoods are anchored to thetop of the base by rings 3! and to the posts 3 by rings 32 seated ingrooves 33 in the posts. The upper ends of the two wobble posts 3 aresecured to the pads 22 in the same manner as the wobble posts 2, asshown in Figure 2. Angle members 34 connect the pads of the posts 2 withthe pads of the posts 3. These angle memupon the base drives a belt 42which surrounds a pulley 43 secured upon a shaft 44 extending into thegear box. The manner of gearing the shaft 44 to the shaft 391 in thegear box has not been illustrated, since it may be effected in anywellknown manner.

It will be noted that the crank pin 31 is eccentric to the axis of theshaft 3911 that supports the fly wheel, which constitutes means forrotating the crank pin 31. Consequently, when the fly wheel is rotated,the crank pin 31 will rotate in a circle and impart a gyratory movementto the screen box 35 which is supported and secured upon the angle bars34 and 34a. The weight of the screen box is supported by the four wobbleposts and little, if any, weight thereof is transmitted through thecrank pin 31.

The chassis is more clearly shown in Figure 6, and it will be noted thatadditional transverse angle bars 3412 are located between the angle bars34 and 34a. The ends of these angle bars are secured to longitudinallyextending angle bars 340. The angle bars 340 have upstanding flangesthat form the outer edge of the chassis and thus provide a depressedseat for the sifter box I. At the ends of the angle bars 340 aretransverse angle bars 34d that confine the ends of the sifter box, whichmay be bolted or secured in said seat in any approved manner.

In the operation of the machine, the rotation of the fly wheel 39 willcarry the crank pin 31 around in a circle and impart a gyratory movementto all parts of the sifter box in contradistinction to prior art devicesin which only the forward portion of the sifter box is rotated and therear part is reciprocated.

During the gyratory movement of. the sifter box, the wobble posts 2 and3 are constrained to move in proper alignment, that is, one cannot movein one direction and another in the opposite direction, due to the shaft6 which rocks or oscillates in its bearings and causes the twocontrolled posts 2 to move in alignment. The posts 3 must likewise movein unison in the same direction as shown in Figure 6. It will beappreciated that the posts 2 can pivot on the pins H and can rotate orrock the shaft 6 which forms the controlling element for causing thewobble posts to move in unison and alignment.

While the throw of the crank pin 31 is short as illustrated, it iscontemplated that a spider with a crank pin having a longer or shorterthrow may be used as desired.

The provision of the lubricant chambers maintains the posts properlylubricated during operation and the hoods or stockings protect thelubricated parts from dirt and dust, whereby a highly eflicientapparatus is obtained.

It is realized that attempts have heretofore been made to use wobbleposts for supporting a sifter, but no proper means were provided thereinfor controlling the movements of the posts, and in most cases the weightof. the sitter box was sustained by the crank pin.

From the foregoing, it will be appreciated that a novel supporting meansfor a sifter box has been invented that always supports the weight ofthe sifter box and relieves the operating crank from carrying any of theload.

We are aware that many changes may be made and numerous details ofconstruction may be varied through a wide range without departing fromthe principles of this invention, and we, therefore, do not purposelimiting the patent granted hereon otherwise than is necessitated by theprior art.

We claim as our invention:

A gyratory sifter comprising a sifter table, means to drive said table,a base, a rocker shaft journalled in bearings on said base, a first pairof wobble posts in longitudinally spaced relation, each of said postsbeing connected at its upper end to said sifter table by ball joint andsocket means, each of the wobble posts at its lower end being connectedto said rocker shaft by means constraining said posts to rockingmovement with said shaft and pivotal movement relative to said shaftabout an axis extending transversely of said shaft, and a second pair ofwobble posts in longitudinally spaced relation and each connected at itsupper end to said sifter table by a ball joint and socket means, andhaving a universal pivotal connection at its lower end with said base,said wobble posts constituting supporting means for said sifter tablewhereby said driving means are substantially relieved of the weight ofsaid table.

EUGENE G. BERRY. CARYL L. REIMULLER.

